COMMUNITY-ROLES.md: fix links, improve wording

The message templates for role changes pointed to the governance guidelines,
but this document is the one that actually describes them.
So this commit changes links to GOVERNANCE.md
to point to COMMUNITY-ROLES.md instead.

In addition, some wording changes were made elsewhere that hopefully make the intended message clearer.

COMMUNITY-ROLES.md

@@ -91,7 +91,7 @@ Open an issue with the following message:
 You now have had five distinct pull requests merged (\[LINKS TO THE RELEVANT PRs]),
 which qualifies you to become a collaborator in this repository,
 as explained in our
-\[governance guidelines](https://github.com/tldr-pages/tldr/blob/master/GOVERNANCE.md).
+\[community roles documentation](https://github.com/tldr-pages/tldr/blob/master/COMMUNITY-ROLES.md).
 >
 > As a collaborator, you will have commit access
 and can therefore merge pull requests from others, label and close issues,
@@ -116,7 +116,7 @@ Open an issue with the following message:
 > Hi, \@username(s)! After joining as a collaborator in the repository,
 you have been regularly performing maintenance tasks. Thank you for that!
 According to
-\[GOVERNANCE.md](https://github.com/tldr-pages/tldr/blob/master/GOVERNANCE.md),
+\[COMMUNITY-ROLES.md](https://github.com/tldr-pages/tldr/blob/master/COMMUNITY-ROLES.md),
 you've now met the thresholds to be effectively considered
 an active maintainer of the project (\[LINKS TO THE RELEVANT PRs]).
 To publicly acknowledge that fact, we'll add you to the tldr-pages organization.
@@ -137,8 +137,8 @@ Open an issue with the following message:
 > Hi, \@username(s)! You've been an active tldr-pages org member for over 6 months.
 Thanks for sticking around this far and helping out!
 According to
-\[GOVERNANCE.md](https://github.com/tldr-pages/tldr/blob/master/GOVERNANCE.md),
-you're now eligible for becoming an owner of the organization.
+\[COMMUNITY-ROLES.md](https://github.com/tldr-pages/tldr/blob/master/COMMUNITY-ROLES.md),
+you're now eligible for becoming an owner in the organization.
 >
 > That means you will, from now on, be part of the team
 responsible for performing role changes (like this one!) in the community.
@@ -159,24 +159,24 @@ Afterwards, add their name to the list of current organization owners below.
 Open an issue with the following message:
 
 > Hi, @username(s)! As you know, our
-\[governance guidelines](https://github.com/tldr-pages/tldr/blob/master/GOVERNANCE.md)
-define processes for keeping the list of organization members
+\[community roles documentation](https://github.com/tldr-pages/tldr/blob/master/COMMUNITY-ROLES.md)
+defines processes for keeping the list of organization members
 in sync with the actual maintenance team.
 Since you haven't been active in the project for a while now,
-we'll be moving you to the status of former maintainer.
+we'll be relieving you from the maintainer responsibilities.
 >
 > In practice, not much will change on your side,
 since you'll remain a collaborator in the repos you have been active in,
 so \*\*you will keep the ability to commit, merge PRs, label and close issues, etc.\*\*,
-if you feel so inclined. But even if you don't,
-keep in mind that every bit of work you already did for the tldr-pages project
-was a voluntary gift of your time to this community.
+whenever you feel so inclined. If you don't, that's all right too!
+Every bit of work you already did for the tldr-pages project
+was a voluntary gift of your time to this community, which is deeply appreciated.
 Your efforts have contributed to a project
 which helps hundreds of people every day — be proud of it!
 >
-> And of course, you're welcome back anytime as a maintainer, if you so choose
-— in which case we'll re-add you to the organization,
-as is also described in the guidelines.
+> And of course, you're welcome back anytime as an active maintainer, if you so choose
+— in which case, just let us know and we'll re-add you to the organization,
+in accordance to the principles of our governance guidelines.
 In any case, we wish you the best of luck in your new endeavors!
 
 Once they acknowledge the message (or after a week without any reaction),
@@ -190,4 +190,4 @@ close the issue opened to track this process.
 
 
 ## Who can change roles
-Owners of the tldr-pages organization can change roles. A list of these people can be found in [MAINTAINERS.md](https://github.com/tldr-pages/tldr/blob/master/MAINTAINERS.md).
+Owners of the tldr-pages organization can change roles. A list of these people can be found in [MAINTAINERS.md](https://github.com/tldr-pages/tldr/blob/master/MAINTAINERS.md).